A novel titanium-iduced aromatic dicrbonyl coupling. Synthesis of a chiral strained polynuclear aromatic hydrocarbon
作者:Israel Agranat、M. Rachel Suissa、Shmuel Cohen、Roland Isaksson、Jan Sandström、Johannes Dale、David Grace
DOI:10.1039/c39870000381
日期:——
The titanium-induced coupling of 10,11-dihydro-5H-dibenzo[a,d]cyclohepten-5-one (3) gave 10,10′11,11′-tetrahydro-5,5′-bis(5H-dibenzo[a,d]cycloheptenyl)(5) and the chiral bridged diphenylanthracene (4), which was resolved and has a racemization barrier of ∼23 kcal/mol (1 cal = 4.184 J); the crystal structure of (4) has been determined.
钛诱导的10,11-dihydro-5 H -dibenzo [ a,d ] cyclohepten-5-one(3)的偶联反应得到10,10'11,11'-tetrahydro-5,5'-bis(5 H -二苯并[ a,d ]环庚烯基)(5)和手性桥联的二苯基蒽(4),其被拆分并且具有〜23 kcal / mol的消旋化势垒(1 cal = 4.184 J);已经确定了(4)的晶体结构。